If looking for someone in the West Midlands, I use tint centres in Wolverhampton.
ive had 5 of my cars done by them over the years, never had a problem, and I only go for the budget film. (Which has lasted years and still looks brand new)
on my ep3 it cost me £59 for the rear windows at 5%.
They do a lot of work for main dealers like bmw etc.
5 landport road,
Wolverhampton,
wv2 2qj
01902 352772